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Charge and Current

How many fara...

Question

How many faradays are needed for reduction of 2.5 moles of $C r_{2} O_{7}^{2 -}$ into $C r^{3 +}$ ?

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Solution

The correct option is A 15
$n_{f a c t o r} = 2 \times (3) = 6 (f o r 2 {C r}^{+ 6} \to 2 {C r}^{+ 3})$
$∴$ Number of equivalent $= (n_{f a c t o r} \times n o . o f m o l e s)$
$= (6 \times 2.5)$
$= 15 e q u i v a l e n t$
Or, $15 f a r a d a y$ .

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